Question

correct the one word that is spelled incorrectly.
though the new treatment has produced excelent outcomes in early testing, dr. hoffman warned that it will be months before we receive approval to expand our subject pool.

Explanation:

The word "excelent" is misspelled. The correct spelling of the word meaning "very good" is "excellent". We identify the misspelled word by checking the standard English spelling rules.

Answer:

The incorrectly spelled word is "excelent", and the correct spelling is "excellent".